Brake valve device



May 31, 1932. E: K, LYNN 1,860,423

BRAKE VALVE DEVICE Filed May 16 1931 INVENTOR.

EWING K. LYNN A TTORNEY.

Patented May 31, 1932 PATENT* rama EW'ING K. LYNN, OF EAST MCKEESPORT, PENNSYLVANIA, ASSIGNOR T0 THE WESTING- HOUSE AIR BRAKE COMPANY, OF WILMERDING, PENNSYLVANIA, A CORPORATION OF EENNSYLVAN IA Application filed May 16,

" position for releasing the brakes at one side after'the brakes have been applied at the opposite side, then the brakes could not be ap plied at the opposite side, and another lobject oity my invent-ien is'toy provide means for moving the brake valve from said release position, when the hand is removed from the brake valve handle. j c

In the accompanying drawings; Fig. 1 is a diagrammatic view, partly in section, of

'1 ya fluid pressure brake equipment embodying my invention; Fig. 2 an end eleva-tion view of one of the brake valve devices shown in Fig. 1, showing the different operating positions of the brakevalve; Fig. 3 is a section on the line 3-3 of Fig. 2;V Fig. 4 isa detail view of the actuating. pinA associated with the brake valve handle return mechanism; Fig. 5 a section on' the vline 5--5 of Fig. 1; and Fig. 6 asection on the line 6-6 of Fig. 1.

The equipment shown in-Figcl is adapted more particularly for use on electric locomotives or gas Vor oil electric locomotives, where theY operator has acontrol station'at each of the opposite sides of the locomotive cab. Brake valve devices A and B at opposite sides of the locomotive cab are of identical construction andcont'rol the supply and release of uid underfpressure to andl from a brake cylinder 1. A main reservoir 2 adapted to be maintained charged with fluid under pressure is connected by a pipe .3 to" both brake valve devices and a double check valve device i controls communication from a brake cylinder pipe y5 to thebrake valve devices.

The brake valve devicesA and Beach com- IBRAKE VALVE DEVICE 193i. serial No. 537,762.v

prise a casing 6 containing a rocker shaft 7 having an end projecting out of the casing to which is secured a handle 8. Mounted in a chamber 9 of the casing 6 is a fluid pressure pressure exhaust or release poppet valve 13 is mounted in a chamber 14C of the casing 6 and is provided with a stem 15 adapted to be engaged by a raised portion of a plate 16, which plate is secured to the shaft 7, within a recess cut in the shaft.

' Disposed below and in axial alinement with the valve 13 is a double seating valve 17, said `valve being adaptedyto permit flow around the valve, when the valve isin a position intermediate its opposite seats. The valve 17` is provided with a stem 18, adapted to be operated yby a downward movement of the `valve 13, so as to move the lvalve 17 from its upper seat, when desired. A spring 19 urges the valve 10 to its seat, anda spring.

2O urges the valve 13 to its seat;

The usual quadrant 20 is secured to a ylug 21 carried by the casing 6 and also secured to said lug isa plate 22 having an inturned portion 23. Carried by the handle 8 is a cylindrical casing 24 and mounted in said` casing is a pin 25 having one end projecting through an opening yin the-handle and positioned to'engage thefportion 23. The pin carries a collar 26 for limiting outer movement of the pin and acting as an abutment for a coil spring-27 which -is mounted in the casing 24, and hasits outer end in engagelment with a flange carried by alguide member 28, which member acts as a guide for the pin 25.

The parts are so adjusted that the spring 27 is compressed, when the handle 8 iskmoved to the `position marked Release in Fig. 2, by the engagement of pin 25 with the portion-23, and so that it the handle is released, the pressure of the spring 27 acts to move the handle 8 to the position marked Running.

The double check valve device l comprises a casing in whicha double check valve 29 is mounted. A pipe 30 leads from the chamber lSo 14 of the brake valve device A to the chamber at one side of the double check valve 29, and a similar pipe 30 leads from ch amber 14: of the brake valve device B to the chamber at the opposite side of the check valve 29. A pipe 32 connects chamber 31 of the brake valve device A to pipe 30, and a pipe 32 connects chamber 31 of the brake valve device B with pipe 30.

When the check valve 29 is in the position shown in Fig. 1, the pipe 3() is connected to the brake cylinder pipe 5 through a cavity or port 33, and when the check valve 29 is moved to its opposite position, the pipe 30 is connected, through cavity 33 with the brake cylinder pipe 5.

In operation, if it is desii'ed to eli'ect an application of the brakes, the brake valve handle 8 of either the brake valve device A or B is moved to application position, as marked in Fig. 2. The rocker shaft 7 is thus rotated so that the raised portion of plate 12 engages the stem 11 and depresses same, and thereby the valve 10 is unseated. In this rotation of the shaft 7, the raised portion of plate 16 is moved away from the stem.l 15, so that the valve 13 is permitted to seat or remain seated.

Assuming that the brake valve device A is the operated brake valve, when the valve 10 is unseated, fluid under pressure is supplied fromythe main reservoir 2, through pipe 3 and past the valve 10 to chamber 34 and thence through passage 35 to chamber 14:, which is connected to pipe 30. Fluid under pressure then flows through pipe 30 and shifts the double check valve 29 to the position shown in Fig. 1, in which the pipe 30 is connected to pipe 5 and the brake cylinder 1.

When the desired brake cylinder pressure is obtained, the brake valve handle S may be shifted to lap position, if it is desired to hold the brakes applied. In moving from application to lap position, the raised portion of plate v12 moves away from stem 11, permitting the valve 10 to seat and cut ofi' the further supply of uid to the brake cylinder, while such movement is not suflicient to cause the eX- haust valve 13 to be unseated. Y

The brakes may be released by moving the brake valve handle to ruiming position, in which movement, the raised portion of plate 16 operates to move the stem 15 and thereby unseat the exhaust valve 13. With valve 13 unseated, fluid under pressure is released from the brake cylinder, through pipe 30, past the open valve 13 to atmospheric exhaust port 36.

If the operator wishes to go to the other side of the cab and desires to make an application of the brakes before leaving, he operates the brake valve handle, as hereinhefore described, to effect the supply of fluid under pressure to the brake cylinder, and

then moves the brake valve handle to lap position.

When the brakes are applied by operation of the brake valve A, fluid under pressure is supplied from pipe 30 to pipe 32 and acts in chamber 31 on the double seating valve 17, so as to shift said valve to its upper scat. By this means, possible release of the brakes at the non-operating side of the cab is prevented,'regardless of the position the brake valve at the non-operating side may have been left in.

At the other side of the cab, if the operator has gone from the side having the brake valve A to the side having the brake valve B, the operator may release the brakes, as previously applied at the brake valve A, by moving the handle 8 of the brake valve B to release position. In moving to release position, the valve 13 is moved beyond the normal release position of the valve, which is assumed in the running position, so that the valve 13 engages the stem 13 of the double seat valve 17 and moves the valve away from its upper seat. This establishes communication from pipe 32 and chamber 31 to chamber 14 and thence to the atmospheric port 36, past the unseated release valve 13. Fluid is therefore released from the brake cylinder 1 by way of the pipe 32', and thereafter, the brakes may be either applied or released by operation of the brake valve device B, in the same manner as hereinbefore described in connection with the brake valve device A.

The operator may go from one side of the cab to the other without first making an application of the brakes, in which case, the brake valve handle is merely left in running position. y

The brake valve handle should not be left in release position, however, since this would prevent the brakes from being applied at the opposite side of the cab, by reason of the double seating valve 17 having been left at the non-operating end in its unseated position, in which fluid supplied to the brake cylinder can escape by flow from chamber 31 around the valve 17 to chamber 14 and thence past the release valve 13 to the exhaust port 36.

In order to prevent the operator from leaving a. brake valve handle in release position, means are provided for automatically moving the handle from release to running position, when the operator releases the handle in release position.

When the operator moves the handle 8 to release position, the engagement of pin 25 with the portion 23 causes the spring 27 to be compressed and then when the handle is released by the operator, the pressure of the spring shifts the handle back to running position.

When the brake valve B is the operating brake valve, upon supplying fluid under presto pipe32 and thence to chamber 31 of the v brake valve device A, so that the double seating valve 17 of the brake valve A is moved to its upper seat to prevent the brakes from being released at the brake valve A.

While one illustrative embodiment of the invention has been described in detail, it is not my intention to limit its scope to that embodiment or otherwise than by the terms of the appended claims. f

I-Iaving now described my invention, What I claim as new and desire to secure by Letters Patent, is

1. In a Huid pressure brake, the combination With a brake cylinder, a pair of brake valve devices disposed at separated positions on a vehicle, and each brake valve device operative to control the supply and release Vof fluid under pressure to and from the brake cylinder, andV a double check valve for controlling communication through which each brake valve device supplies and releases fluid to and from the brake cylinder, of a check valve associated With each brake valve device and each check valve operable vby the corresponding brake valve device for opening a. communication for venting to the atmosphere fluid supplied to the brake cylinder by operation of the other brake valve device. f

2. In a fluid pressure brake, the combination with a brake cylinder, a pair of brake A valve devices disposed at separated positions on a vehicle, and each brake valve device operative to controlthe supply and release of fluid under pressure to and from the brake cylinder, and a double check valve forcentrolling communication through which each Vbrake valve device supplies and releases fluid to and fromthe brake cylinder, of a checky valve associated With each brake valve device and either check valve subject to the pressure of fluid supplied to the brake cylinder by operation of the other brake valve device and tending to seat `the valve, each brake valve device being operable to unseat the corresponding check valve, so as to vent fluid sup plied to the brake cylinder by operation of the other brake valve device.

3. In a fluid pressure brake, the combination with a brake cylinder, a pair of brake valve devices located at diii'erent points on a vehicle, and each brake valve device 0perable to supply and release fluid under pressure to and from the brake cylinder, and a double check valve for controlling communication through Which each brake valve device supplies luid to and releases Huid from the brake cylinder, of means operated upon movement of one brake valve device to one position for releasing from the brake cylinderiiuid supplied thereto by operation of G5 the other brake valve device.

4. Ina uid pressure brake, the combination with a brake cylinder, a pair of brake valve devices located at different points on a vehicle, and each brake valve device operable to supply and release fluid under pressure to and from the brake cylinder, a double check valve for controlling communication through Which each brake valve device supplies fluid to and releases iuid from the brake cylinder, of means operated upon movement of one brake valve device to one position for releasing Jfrom the brake cylinder uid supplied thereto by operation of the other brake valve device, each brake valve device having another position for normally .controlling the release of Huid from the brake cylinder,

a brake valve handle, and means for moving the brake valve device from the first mentioned release position to said normal release position upon release of the handle.

5. I n a fluid pressure brake, the combina tion with a brake cylinder, a pair of brake valve devices located at diierent points on a vehicle, and each brake valve device opof one brake valve device to one position for releasing from the brake cylinder iiuid supplied thereto by operation of the other brake valve device, each brake valve device having another position for normally controlling .y the release of fluid from the brake cylinder, a brake valve handle, and spring operated means urging the brake valve handle fromk the first mentioned position to said normal release position. f f

In testimony whereof I have hereunto set my hand, this 14th day of May, 1931.

EWING K. LYNN. 

